Guillemot
| Name | Guillemot |
| Type | Light vessel |
| GRT | |
| Country |  British |
| Built | 1893 |
| Builder | Wm Allsup & Sons Ltd., Preston |
| Operator | Commissioners of Irish Lights, Dublin |
| History | The South Arklow Light Vessel. |
U-boat attacks on Light vessel Guillemot
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 28 Mar 1917 | UC 65 (Otto Steinbrinck) | Sunk | Scuttled 1.5 miles W of Hook Point, Waterford (near the South Arklow Bank). | 0 |
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